Evaluating the resource management and profitability efficiencies of US commercial banks from a dynamic network perspective

Financial Innovation

Table 1 Summary statistics of DEA variables

Variable	Mean	St. Dev	Minimum	Maximum
Input
Staff expenses	870.07	3,659.49	1.38	36,965.00
Other expenses	2,731.11	10,690.63	3.58	135,517.00
Exogenous input
Interest expense	772.99	3,165.31	0.35	38,964.41
Carryover (Free)
Bank premises_t−1	584.68	2,373.79	0.72	38,448.22
Equity_t−1	6,880.71	27,264.38	2.16	279,354.00
Carryover (Undesirable Output)
Total debts	12,889.18	58,353.59	0.25	753,752.00
Nonperforming assets	710.07	3,670.56	0.03	57,392.29
Intermediate
Deposits	50,527.99	186,327.08	62.38	2,144,257.00
Investments	12,537.51	54,536.31	4.11	750,634.00
Output
Interest income	1,608.23	5,969.08	2.04	57,245.00
Noninterest income	1,180.48	5,350.36	0.05	64,980.00

The variables are measured in millions of US dollars. Staff expenses are the total compensation paid. Other expenses include noninterest expenses such as selling and administrative expenses. Interest expenses are interests paid and payable on any borrowings or debt. Bank premises are the property, plant, and equipment. Equity is the difference between a bank’s assets and its liabilities. Total debts are amounts due of borrowed money. Nonperforming assets are loans or advances that are in default or in arrears. Deposits are money placed into a deposit account at a bank. Investments are money that a bank receives from customers and invests in a variety of assets. Interest income is the money that a bank earns from lending its funds. Noninterest income is income that are generated by noninterest related activities such as fees and commissions